Did you know that some plants can be propagated by rooting a piece of the cut plant in soil? AND that taking those cuttings is the key to getting bushier plants, with more blooms… it’s called “pinching.”

First, a quick refresher in basic botany and then step-by-step instructions!

1. Start seed.

I used to REALLY go nuts starting annuals in the house… but this year I’m doing just one—Benary Giant Zinnia… also sometimes called giant zinnia or dahlia zinnia… (I used to order mixed seeds, but now I order individual colors.)

Theoretically, you don’t need to start this in the house. But if you do, I can nearly guarantee you a 100% germination rate… not to mention you get a head-start with the size of the plants. (I can also guarantee that having a temporary greenhouse in your kitchen is really annoying.)

2. Seed + lights + water + 48 hours = germination.

Depending on the temperature and the quality of your seed… you should see sprouts within a few days. Disclaimer: if you buy seeds (or anything) from a place that also sells tires and milk, don’t be surprised if they don’t perform the way you want. This goes quadruple for dahlia tubers.

I use this heat mat (it’s bigger than most) for the zinnia seedlings… which isn’t necessary, but if the seeds are in a really cool place, you might want to consider it. Zinnia loves warmth. The heat mat speeds up germination, and also growth, which gets me to the pinching part faster…

Say hi to Elvis.

3. Basic botany lecture:

New plant material grows from the spot where the leaf joins the stem.

The first leaves that appear on a plant, are not actually leaves. They’re called cotyledon… They are the predecessors to the first true leaves. Eventually they may turn yellow or brown and fall off. This is totally fine and does not mean the plant is dying.

What emerges after the cotyledon are the first true leaves. Never cut off the first true leaves… because that is where all the new growth comes from.

Although frankly, whoever wrote the rules of botany never grew zinnia, since I’ve seen them sprout from the cotyledon lots of times… but to be safe, especially with other plants, play by the rules…

4. Pinching.

Pinching applies to lots of plants, flowers, and herbs… But not all of them. If you’re not sure, google it.

Once you have your first true leaves, what emerges over top of that is what we take off.

Removing the primary bud releases the axillary buds… Meaning you force the plant to sprout two branches instead of one, giving you a fuller plant. Do you have to do this? No. Not at all. But I don’t know why you’d want a skinny plant rather than a bushy plant…

What comes next determines a couple of things, so we’ll come back to this step in a minute.

I let this seedling get bigger than I normally would before pinching, so it would make a clear demonstration… you don’t need this much stem.

5.Rooted cuttings.

The part you cut off the plant is called a cutting. And it will root itself and give you a WHOLE NEW PLANT.

If you don’t want the effort, no problem! Toss it… you are DONE!

If you have OCD like me, and would never consider NOT getting more plants… read on.

If you’re doing this later in the season, you can stick them right in the dirt where you want them and keep them watered, and they’ll grow right there… Last year, I had a full-size zinnia fall over, and I just cut it up, stuck it in the ground, made sure I watered well for a week… and had five more plants.

If it’s still cool outside— you’ll need to bring them inside… the cuttings need warmth to grow roots.

Some people will use rooting hormone… I don’t.

So now is where we go back to step four—pinching. Pinching means literally using your thumbnail and index finger to pinch off the top part of the plant. But if you want to use it as a cutting, you don’t want to squish the stem, so you need to cut it with a razor or knife.

And, if you want to take cuttings, you’re going to need to let the seedling get big enough to have a viable cutting.

If you don’t want to take cuttings, and you only want to pinch the plant to make it fuller, you can pinch off the plant over the first true leaves as soon as possible, so that no extra energy goes into producing plant material you’re just going to cut off.

6. Wait.

Your cuttings will take about two weeks to establish new roots. It may look REALLY CRAPPY in the meanwhile.

Keep it watered… don’t let it dry out, since at first it doesn’t have any roots at all!!

When it gets big enough, you’ll want to pinch it… by that time I’m usually maxed out on this process, but you could keep going with that cutting if you wanted.

7. Harden off.

Don’t forget to slowly expose your new seedlings to the elements. A partly shady spot, with gradually more sun over a few days will acclimate them without shocking them.

If you have a place in your driveway, and your husband comes home after dark, that may not be the right spot.

8. Plant your seedlings!

Think about some kind of support system… If you’re just planting one row, I don’t think you’ll have a problem, but if you’re growing a deep bed of them, you’ll want something in place.

Last year I didn’t stake, and by the end of August, I wished I had… a few fell over and it caused mass chaos with everything wanting to join the revolt.

I can’t say for sure yet what my best recommendation is, but I’m planning to try tomato cages every three plants…

9. Get Excited!!!

This is the first generation seedling… the original plant grown from seed.

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47 Comments

This is way more involved than I normally get in the garden, but I am going to try zinnias this year. We shall see how I do. No promises can be made. However, one trick that a neighbor gave me for growing any seeds is to put the seeds in a glass of water for a week before planting them. They will sprout in there, and he says that it will help ensure that they will grow. It seems to have helped in my garden where the little lettuces have started poking up their heads.

So, I planted a bunch of (like, 50) zinnia seedlings in several gardens that I started inside under grow lights, and have directly sown about 17 billion zinnia seeds in some other gardens as well. Water – except for the areas where I planted the seedlings – has been a little scarce. It’s supposed to rain today (rain, dammit, RAIN!!), so I’m hopeful. Based on the aforementioned, and your experience growing zinnias, any idea as to how many I can expect to actually grow and flower?

We’re short on rain here too… my guess with the seedlings is that they should all be fine. Barring frost or acts of God…

The direct sown seeds I would have thought would be fine too… but in my last post, someone commented that they hadn’t had great luck with sow and grow. That surprised me, seeing as how they’re so hardy once started.

Either way, let me know… especially since you’re doing both, I’d be curious if you think the effort of starting them inside is worth it.

Have you thought of driving some sort of stake (like bamboo or pruned off branches of something) into the ground so it’s sturdy around the outside and maybe a few inside of the bed and run twine or something in a grid pattern between the stakes? May be cheaper (also may be way more problematic) than tomato cages.

Me and staking anything with twine have a dysfunctional relationship. I always wait until it is FAR too late… and it always turns out that the things I staked are never the branch/piece that I should have… and then I end up tying the whole thing together.

Plus, I have 1,000 tomato cages anyway… that are totally useless for actual tomatoes. And should be used for something. Plus, isn’t it an appealing idea to JUST stick a cage in the ground and be done with it?

BTW, we did that stringing-method with tomatoes one year, and were not impressed. Or, rather it was fine at first… and then totally out of control.

I had great success with the stringing method last year and got lots of beautifully tasty tomatoes, but things also have a tendency to grow slower in this climate than they do pretty much anywhere else. If they do get out of hand, I have read about another method of support that will be easy to add in that involves basically figure-8ing the plants with string/twine to hold them vertical.

I agree about the total uselessness of tomato cages. I don’t know how they get off manufacturing something that is so useless at it’s supposed purpose. It’s like they’re the cosmetics industry. I’m currently using one of the 3 cages that I own to try to support my peony… unsuccessfully.

When I said stringing, I meant the figure 8 method… by the end of summer, it was laughable to try to “control” the plant with string. I needed heavier rope… and taller stakes… and I guess also a ladder?

One of my favorite hobbies is picking at things.. Scabs, peeling paint, sunburns, my face, onion skins, and suckers. I was very obsessive about how I pruned the indeterminate vines last year and was “rewarded” with somewhat spindly, but effective and controlled growth. Plus lots of tomatoes.

I have a disgusting (and compulsive) habit of peeling dry skin off my lip…It’s amazing I have not permanently disfigured my face from picking at it. (there’s still plenty of time for that, I guess)

My summer hours are dedicated to picking bugs off kale. I CANNOT have another garden task. I CANNOT. Although, after watching you do yours this year, maybe you will convert me. A friend tried it, and he said he’d only noticed a benefit if working in restricted space…

Victoria,
Holy cow. This is pretty amazing, and I know this is my west coast inexperience talking (because any mildly enthusiastic gardener in the East probably knows how to do this stuff), but I’m thoroughly impressed. I tried to grow ‘forget-me-not’ seed this year…wish I had seen this post first. I’ve seen your zinnias and they make me green with envy. That said, the seed I tried to grow was looking good until we had a freakish overly-hot day and even the shade didn’t protect the babies. Mr. B asked, after noticing there was only brown, withered plantings in the containers, what I was going to grow in the plant containers I had sitting in the shade.

The whole planting bed with light is the only hiccup for me. No room in the garage or house. Can’t wait to see what you come up with for the linky party next week…way to put pressure on a blog friend!
Karen

I’m pretty sure I took biology (and even paid attention), but for whatever reason I did not know most of these things, so this is extremely informative. I generally understand that certain parts cut off of certain plants can form their own roots, but I thought the only system governing what and when was Murphy’s Law: in other words, when I cut bits off my climbing roses because I want more roses for free, they will not form new plants, and the cuttings will die; when I dig weeds to prepare my raised beds and chop them in pieces with the shovel and I accidentally leave a tiny piece of weed stem in the bed with my squash, it will form the world’s largest dandelion at night while I am sleeping, take over the bed, and murder the squash. I’m pretty sure this is still true, but if you say you can make two zinnias from one, then I will believe you, and also, I will not freak out if one of the wee pots I’ve set up fails to take, because I can MAKE MORE. Theoretically. (I am not going to pinch the plants to make them bushier, because I can see the result as clearly as an oncoming train: whatever I remove will be exactly what that plant needed for its survival, and every single thing I’ve planted will die, except faster than last year.)

Sort of related musings: I couldn’t find the “Benary” zinnia at the store where (I know) I should not have bought them, so I bought a different kind of giant repeat-blooming zinnia. I started them in tiny pots on Sunday, because if I can see them before they go in their bed, I have some chance at telling which things are weeds. They are germinating (I like to think) on the “sun” porch, which faces East; they’re getting very little direct light. I would haul them outside and put them in crazy sunlight (here in the swamp, we have lots of that), but it is raining all day, and probably all week, and it will not be specially warm. I imagine this would kill them. (I kill all my plants; I come up with a new method every time. I am just trying to avoid the obvious ones.)

Am I doomed because I started them before a week of bad weather? Will they germinate EVENTUALLY in limited light? Can I just put them in the bright sun next week? Would they survive the rain? Should I just admit this is futile and buy some stupid pansies? Many thanks for your extremely wise guidance. I have decided to hold off loathing you for your magnificent garden until August, when my gardening failures will be complete.

I’m copy and pasting your description of Murphy’s law of gardening to a safe place… it’s really the best definition I’ve read.

I do not know why nature made it so difficult to grow pretty things, and so easy to grow weeds… although I guess it’s a matter of perspective, since my neighbors grow a particularly invasive weed, as a flower. They love it. And they say things like—how hardy it is… and I’m like, yes! It’s EATING my yard. Do you not see me out here all summer? Digging it up???

I wish I could say your zinnia will be fine… but I really have no idea. They MIGHT be. Especially if you put them out in full sun… you could even put them out in the rain. Since theoretically if it wasn’t raining, they’d be getting sun… which is probably better than being inside?

Or just put the seeds where you want and mark the spot with a toothpick?

p.s.- by August, the bugs will have destroyed the veg garden, and I will be telling you all to never bother growing anything again.

You just pulled back the curtain and revealed why Martha is who she is and why you’ll make a fabulous replacement. This looks like a ton of work! But great reward when your new little plants grow into amazing flowers.

And next time you tell me you don’t have patience for something I’m just gonna say, “Whatever… Plant Girl.” 😉

Let me just say that this is much much more effective than me using my butcher knife to go to town on my hosta plants in the soil. I so need to get on doing this with the new plants I got. That I don’t know the names of. At all.

I am in the garden as often as I can be these days, too. My hands are usually too dirty to get anywhere close to the camera, though, so there is precious little evidence. It’s bad news. BUT I have a suggestion for your zinnias. Have you considered peony hoops? they are lower profile than tomato cages, but should get the job done for you. I just them with my ginormous mums that do not know they are supposed to be annuals, and it helps their rotund selves stay relatively upright.

I did consider peony hoops… but I have 1,000 tomato cages (from before I learned how totally ineffective they are for tomatoes.) last year’s zinnia would have cleared the top of a cage (about,) so I’m hoping that mixing them in will get them camouflaged…

Wow – you seriously know a lot about gardening! Your house looks like a science lab. I’m thinking of starting a vegetable garden…maybe you could do the research for me and then do a post on it….please. 😉 That would be awesome. Thanks in advance. 🙂

Great botany tutorial! I am jazzed about sowing my zinnia seeds. (Yes, you talked me into it … you also talked me into little disco balls at Christmas, so you are a very influential woman!) This is a hard time of year to do anything BUT gardening because if you don’t, the weeds will get ahead of you and you’ll be lost all season. So much for our kitchen remodel! HA! I wish everyone luck with our zinnias … just think of them growing all across the country (all around the world?) … a zinnia nation!

I just did some googling and found that there are many white and purple zinnias that I can totally put in my front yard (promised myself not to go too crazy with color in the front yard)… There goes the whole “drought tolerant” plan I had!

I don’t know why life thinks I have other things to do than this blog… totally annoying. I overlooked your comment on my last post about not too late for Dahlia… and I’d like to say to you:
a- I am trying to do LESS.
b- You didn’t even need to tell me that because I ordered Emory Paul IMMEDIATELY after googling it. I couldn’t not.

Also, I wish I had one-third the enthusiasm for vegetables as I do for flowers.

I will be fully expecting photos of your emory paul blooms. I do believe that I managed to kill my emory paul over the winter…. or rather the strange super-invasive succulent groundcover that has overtaken one of my beds, may have strangled it to death. It’s quite unfortunate as this is the bed of dahlias that I like the most and like to bring in for cut flowers. The other bed is the “oh shit, what do I do with this tuber?” dahlias and they’re interplanted with nasturtiums which attract aphids.

Were we separated at birth? I ended up buying more tomato plants than I have room for at a plant sale, then got home and frantically found some unclaimed pots to grow them in. Then last night when I was watering, decided that I needed to plant my beans and totally forgot to leave space for the tomatoes. So now I need to buy 2 more pots and somehow scare up enough soil to fill them in the next few days.

Best tutorial I have seen in a long time or maybe ever. I am not going to be growing any Zinnias this year and am mostly working on keeping up with the yard as it is and then once I have a handle on that, will branch out again with flowers. Your the best and the next Rachel Ray.

The only plant I ever bother to root is basil. I like to grow lots of Italian sweet basil to make pesto (which can be frozen, as you may know). But it flowers and then tries to go to seed, which is not good if you want lovely sweet leaves. I used to go around pinching off the flowers, which gets pretty time-consuming, and even so, I’ll miss some and the plant will get leggy. Instead of trying to keep up with the flowers, I make cuttings from some of the plants tips–early in the season, before they starts to flower, put the cuttings in bottles of water on the kitchen counter. When the roots are developed enough to plant, pull up the original plants and make the pesto. Now plant the rooted cuttings. This way, you can have lots of fresh basil leaves throughout the summer. Also, it is nice to not have to make all of your pesto at once.

New reader, here. Can you tell me where you get the lights for your seedlings? I can’t find them on Amazon. Are they just regular fluorescent lights with special bulbs? Thanks. Love your blog. You are a hoot!

I am new to your blog and just saw this article from last spring. I love your style and want to plant zinnias from seed! Can you please clarify the lights and containers you used? How many days did you place the seedlings under light? At what point did you stop using the heating pad? As the seedlings grew, did you have to adjust the light? How many days were they in your house? Once transportted did you have to fertilize a lot during the season? I live in DC so I think the timing will be similar…. if we ever get into SPRING!

Thanks again! I really love your posts. I am also adding a bathroom and have read these posts. I am so glad that I am not alone as it’s taken me months to figure out the darn marble tile and finishes…. My husband is about to strangle me and says “crazy” things all the time regarding purchasing everything at Home Depot . Sigh.

Cheap fluorescents from Home Depot
Random assortment of plastic containers we already have
Keep the seedlings under light until you plant outside
Heat mat is optional… once they sprout, you can remove
Mine went outside before I had to raise the height of the lamps
No idea how many days in my house… I will keep track of that this year!
I’m a leaf-mulch-fanatic… Best fertilizer there is!! I do not use any other fertilizers… I think they are evil. haha.
GOOD LUCK!

Oh! This is brilliant! I have a fittonia that has no leaves on the bottom 4-5 inches due to cat depradations, and now the poor thing is starting to fall over because it has no fullness on the bottom to provide support. Just did a quick lookup, and I can totally pinch the stems and hopefully get both new growth on the old plant, and new growth on the cuttings! Yay! Thank you!!!!!

Hello Victoria Elizabeth Barnes – you are a delight. I just discovered you because I have sown many many zinnia seeds. They’re coming up nicely, which thrills me every morning. (Not too much else happening except that my cat is purring more lately.) My question – I planted them rather densely because I like that look – but everybody always says ‘thin them out thin them out’. Must I?

Well, that depends. If this is your first year doing zinnia, my guess would be that it is LIKELY you have been overzealous.
I myself can relate.

I plant my giant zinnia about 10 to 12 inches apart. It is hard when they are small to imagine just how large the plant will get. And you want it to have plenty of airflow – Zinnia are prone to mildew.

If you are doing a smaller zinnia variety, you might want to plant closer… If you still have the seed packages, the instructions are probably pretty good advice.

Also, don’t forget to pinch them! It makes all the difference in the world in how bushy the plant gets.
xoxo
VEB